Patent GB-366110-A (GB)
Title: Improvements in the manufacture of artificial filaments, yarns and the like
IPC: D01F2/28
Filed: 1930-10-22
Abstract: The Specification as open to inspection under Sect. 91 (3) (a) refers to the addition to cellulose ester and ether lacquers, varnishes, &c. of electrolytes such as metallic salts, for example, aluminium chloride, sulphate or resinate, and barium chloride, or metallic soaps, for example copper, magnesium or zinc oleate, or potassium ricinoleate, or bases, for example triethanolamine, or certain acids. The addition of small quantities of these substances reduces the viscosity of the lacquer &c. so that it may be readily applied as by brushing or spraying.  This subject-matter does not appear in the Specification as accepted.ALSO:The viscosity of solutions of cellulose acetate and other cellulose esters or ethers to be used for the manufacture of artificial filaments &c., is reduced by the addition of small quantities, not more than 4 per cent of the cellulose derivative, of substances which are soluble in the solvent and increase its electrical conductivity, but which are non-solvents for the cellulose derivative.  Quantities as small as 0,05 per cent of the cellulose derivative produce a substantial lowering of the viscosity.  Suitable substances are metal salts, for example, aluminium chloride, sulphate or resinate, and barium chloride; metal soaps, for example, copper, magnesium or zinc oleate, and potassium ricinoleate; and organic bases, for example, triethanolamine.  The process is particularly applicable to solutions in watermiscible solvents, for example, to solutions in aqueous acetone; and it is convenient then to use water-soluble substances and to dissolve these in the water to be incorporated in the spinning solution.  The solutions may be worked up by dry or wet spinning methods; and the silks &c. produced may be of fine denier, and they are readily delustrable by hot or boiling aqueous media, and are of greater pliability than normal silks, especially if the added substance contains a higher fatty acid radicle.  In examples, aluminium sulphate, and copper and zinc oleates are added to acetone solutions of cellulose acetate; when using copper oleate, the faint green colour of the finished silk may be removed by scouring in a dilute acid bath.  The use of zinc oleate or other zinc salts is preferred where iron or galvanized iron apparatus is employed.  Specification 333,504, [Class 2 (ii), Cellulose &c.], is referred to.  The Specification as open to inspection under Sect. 91 (3) (a) refers to the addition of electrolytes in quantities insufficient to cause precipitation of the cellulose derivatives; and to the use of certain acids as suitable additions.  And it mentions that similar additions may be made to lacquers, varnishes, &c. in order that they may be readily applied by brushing or spraying, and also to plastic compositions containing cellulose esters and ethers, the addition permitting of an economy of solvent and shortening of the seasoning period.  This subject-matter does not appear in the Specification as accepted.ALSO:The Specification as open to inspection under Sect. 91 (3) (a) refers to the addition to cellulose ester and ether compositions of electrolytes such as metallic salts, for example aluminium chloride, sulphate or resinate, and barium chloride, or metallic soaps, for example copper magnesium or zinc oleate, and potassium ricinoleate, or bases, for example triethoxolamine, or certain acids.  These substances, which lower the viscosity of cellulose ester and ether solutions, permit of an economy of solvent in the manufacture of cellulose ester and ether plastics, and also of the shortening of the seasoning period.  This subject-matter does not appear in the Specification as accepted.